Ecological Stoichiometric Characteristics of Plants, Litter and Soils of Urban Green Plants
- 建筑土木－已发表论文 
以福建福州市常见的15种乔木、灌木和草本绿化植物为对象,连续2年取样测定了这些植物、凋落物、立地土壤、土壤微生物量C、N、P含量,探讨城市绿化植; 物-凋落物-土壤系统生态化学计量特征,为中国城市绿化植物的生态功能恢复与植被重建提供科学依据。结果表明:(1)绿化植物不同器官C、N、P含量均表; 现为草本>灌木>; 乔木、C含量>N含量>P含量、叶>茎>根,呈现出叶的富集作用;绿化植物各器官化学计量比(C/N、C/P、N/P)也表现出基本一致的乔木>灌木>草; 本的变化趋势;各绿化植物对N的再吸收率极显著高于对P的再吸收率(P; <0.01),绿化植物N和P再吸收率表现为乔木>灌木>草本,不同绿化植物对N的再吸收率差异均显著(P<; 0.05),对P的再吸收率差异均不显著(P>0.05)。(2)绿化植物凋落物C、N、P含量基本表现为草本>灌木>乔木,其中不同绿化植物凋落物P含; 量差异不显著。(3)绿化植物立地土壤C、N、P含量表现为草本>灌木>乔木,但其N/P差异不显著;土壤微生物量C、N、P含量基本表现为草本>灌木>; 乔木,其相应的C/N、C/P、N/P差异均不显著。(4)植物-土壤-凋落物-土壤微生物量(C、N、P)均随着生长季温度的升高而降低,随着年降水量; 的增加而升高,P素的回归系数绝对值明显低于C素和N素;植物-凋落物-土壤的C与N含量、N与P含量、C/P与N/P、以及土壤和植物的C/N与N/P; 之间均呈显著正相关关系,而凋落物的C/N与N/P之间呈显著负相关关系;典范对应CCA排序中,植物高度、冠幅、茎粗、比叶面积和叶面积指数对植物-凋; 落物-土壤-土壤微生物量C、N、P含量和C/N、C/P和N/P具有较大影响作用,其中高度、冠幅和茎粗与比叶面积和叶面积指数呈负相关关系,与凋落物; -土壤-土壤微生物量C、N、P含量呈负相关关系,与植物C、N、P含量呈正相关关系;而凋落物-土壤-土壤微生物量C、N、P含量与其C/N、C/P和; N/P均具有一定的正相关关系。This paper discusses the ecological stoichiometric characteristics of; plants, litter and soils of urban green plants. The results were as; follows: (1) the order of average contents of C,N and P in green plants; from high to low as follows arbors>shrubs>herbs,and the contents of C,N; and P in same ornamental plants of different organs was differ, which; showed leaf>stem>root. (2) The nitrogen absorptivity was significantly; higher than that of phosphorus absorptivity of urban green plants; (P<0.01),and the nitrogen and phosphorus absorptivity showed; arbors>shrubs>herbs, which the nitrogen absorptivity of arbors,shrubs; and herbs had a significant difference (P<0.05) and the phosphorus; absorptivity had no significant difference (P>0.05). (3) The contents of; C,N and P in litter showed herbs>shrubs>arbors, which the content of P; had no significant difference. The contents of C,N and P in soil showed; herbs >shrubs> arbors, which the N/P had no significant difference. The; contents of C,N and P in soil microbial biomass showed herbs > shrubs >; arbors, which the C/N, C/P and N/P had no significant difference. (4); The contents of C,N and P of plants,litter, soils and soil microbial; biomass decreased with the increasing of the temperature of the growing; season and increased with the increasing of the annual; precipitation,which the absolute value of regression coefficient of P; was lower than that of C and N. (5) The contents of C and N in; plants,litter and soils had a significant positive correlation. The; contents of N and P in plants, litter and soils had a significant; positive correlation. The C/N and N/P in litter had a significant; negative correlation. The C/N and N/P in plants and soils had a; significant positive correlation. The C/N and N/P in plants, litter and; soils had a significant positive correlation. (6) Canonical; correspondence analysis showed that the plant height, crown, stem; diameter, specific leaf area and leaf area index had a large effect on; the contents of C,N, P and C/N, C/P and N/P of plant, litter, soil and; soil microbial biomass. The plant height, crown, stem diameter had a; negative correlation with specific leaf area and leaf area index,and had; a negative correlation with the contents of C,N, P of litter,soil and; soil microbial biomass,and had a positive correlation with the contents; of C,N,P of plants, while the contents of C, N,P and C/N, C/P and N/P; had a positive correlation in litter, soil and soil microbial biomass.; This study provides a scientific guidance for restoration of the urban; green plants in China.